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/* params.c - Run-time parameters.
Copyright (C) 2001, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
Written by Mark Mitchell <mark@codesourcery.com>.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "common/common-target.h"
#include "params.h"
#include "diagnostic-core.h"
/* An array containing the compiler parameters and their current
values. */
param_info *compiler_params;
/* The number of entries in the table. */
static size_t num_compiler_params;
/* Whether the parameters have all been initialized and had their
default values determined. */
static bool params_finished;
static const param_info lang_independent_params[] = {
#define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
{ OPTION, DEFAULT, MIN, MAX, HELP },
#include "params.def"
#undef DEFPARAM
{ NULL, 0, 0, 0, NULL }
};
/* Add the N PARAMS to the current list of compiler parameters. */
void
add_params (const param_info params[], size_t n)
{
gcc_assert (!params_finished);
/* Allocate enough space for the new parameters. */
compiler_params = XRESIZEVEC (param_info, compiler_params,
num_compiler_params + n);
/* Copy them into the table. */
memcpy (compiler_params + num_compiler_params,
params,
n * sizeof (param_info));
/* Keep track of how many parameters we have. */
num_compiler_params += n;
}
/* Add all parameters and default values that can be set in both the
driver and the compiler proper. */
void
global_init_params (void)
{
add_params (lang_independent_params, LAST_PARAM);
targetm_common.option_default_params ();
}
/* Note that all parameters have been added and all default values
set. */
void
finish_params (void)
{
params_finished = true;
}
/* Set the value of the parameter given by NUM to VALUE in PARAMS and
PARAMS_SET. If EXPLICIT_P, this is being set by the user;
otherwise it is being set implicitly by the compiler. */
static void
set_param_value_internal (compiler_param num, int value,
int *params, int *params_set,
bool explicit_p)
{
size_t i = (size_t) num;
gcc_assert (params_finished);
params[i] = value;
if (explicit_p)
params_set[i] = true;
}
/* Set the VALUE associated with the parameter given by NAME in PARAMS
and PARAMS_SET. */
void
set_param_value (const char *name, int value,
int *params, int *params_set)
{
size_t i;
/* Make sure nobody tries to set a parameter to an invalid value. */
gcc_assert (value != INVALID_PARAM_VAL);
/* Scan the parameter table to find a matching entry. */
for (i = 0; i < num_compiler_params; ++i)
if (strcmp (compiler_params[i].option, name) == 0)
{
if (value < compiler_params[i].min_value)
error ("minimum value of parameter %qs is %u",
compiler_params[i].option,
compiler_params[i].min_value);
else if (compiler_params[i].max_value > compiler_params[i].min_value
&& value > compiler_params[i].max_value)
error ("maximum value of parameter %qs is %u",
compiler_params[i].option,
compiler_params[i].max_value);
else
set_param_value_internal ((compiler_param) i, value,
params, params_set, true);
return;
}
/* If we didn't find this parameter, issue an error message. */
error ("invalid parameter %qs", name);
}
/* Set the value of the parameter given by NUM to VALUE in PARAMS and
PARAMS_SET, implicitly, if it has not been set explicitly by the
user. */
void
maybe_set_param_value (compiler_param num, int value,
int *params, int *params_set)
{
if (!params_set[(int) num])
set_param_value_internal (num, value, params, params_set, false);
}
/* Set the default value of a parameter given by NUM to VALUE, before
option processing. */
void
set_default_param_value (compiler_param num, int value)
{
gcc_assert (!params_finished);
compiler_params[(int) num].default_value = value;
}
/* Return the default value of parameter NUM. */
int
default_param_value (compiler_param num)
{
return compiler_params[(int) num].default_value;
}
/* Initialize an array PARAMS with default values of the
parameters. */
void
init_param_values (int *params)
{
size_t i;
gcc_assert (params_finished);
for (i = 0; i < num_compiler_params; i++)
params[i] = compiler_params[i].default_value;
}
/* Return the current value of num_compiler_params, for the benefit of
plugins that use parameters as features. */
size_t
get_num_compiler_params (void)
{
return num_compiler_params;
}
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